https://github.com/joostkremers/visual-fill-column.git
git clone 'git://github.com/joostkremers/visual-fill-column.git'
visual-fill-column-mode is a small Emacs minor mode that mimics the effect of fill-column in visual-line-mode. Instead of wrapping lines at the window edge, which is the standard behaviour of visual-line-mode, it wraps lines at fill-column. If fill-column is too large for the window, the text is wrapped at the window edge.
Install visual-fill-column via Melpa, or put visual-fill-column-mode.el in your load path, (optionally) byte-compile it, and add (require ’visual-fill-column) to your init.el.
visual-fill-column-mode is primarily intended to be used alongside visual-line-mode. If you’ve set the option global-visual-line-mode, or if you activate visual-line-mode in major mode hooks, you can customise the option global-visual-fill-column-mode or add the command (global-visual-fill-column-mode) to your init file. visual-fill-column-mode will then be activated in every buffer that uses visual-line-mode.
If you don’t use either of these methods to start visual-line-mode, and instead prefer to call visual-line-mode interactively (i.e., M-x visual-line-mode), you can add visual-fill-column-mode to visual-line-mode-hook in order to activate it automatically when you call visual-line-mode.
Note that visual-fill-column-mode is not tied to visual-line-mode: it is perfectly possible to use it on its own, in buffers that use some other word-wrapping method (e.g., auto-fill-mode), or in buffers that do not wrap at all. You can activate it interactively with visual-fill-column-mode or you can add the command visual-fill-column-mode in mode hooks.
visual-fill-column-mode works by widening the right window margin. This reduces the area that is available for text display, creating the appearance that the text is wrapped at fill-column. The amount by which the right margin is widened depends on the window width and is automatically adjusted when the window’s width changes (e.g., when the window is split in two side-by-side windows).
In buffers that are explicitly right-to-left (i.e., those where bidi-paragraph-direction is set to right-to-left), the left margin is expanded, so that the text appears at the window’s right side.
Widening the margin causes the fringe to be pushed inward. For this reason, the fringes are placed outside the margins by setting the variable fringes-outside-margins to t.
visual-fill-column-width: column at which to wrap lines. If set to nil (the default), use the value of fill-column instead.
visual-fill-column-center-text: if set to t, centre the text area in the window. By default, the text is displayed at the window’s (left) edge, mimicking the effect of fill-column.
visual-fill-column-fringes-outside-margins: if set to t, put the fringes outside the margins.
All three options are buffer-local, so the values you set through Customize are default values. They can also be set in mode hooks or directory or file local variables in order to customise particular files or file types.